Circuit for Linear Frequency-Independent Output from a Differential-Capacitance Displacement Transducer

A circuit that provides an output voltage ideally linearly proportional to the displacement for a differential capacitance-type probe is presented. The circuit is very easily modified to have an output independent of the input supply frequency as well. The component imperfection, however, restricts this independence and produces a deviation at lower frequencies. Pertinent discussions are appended.